/* ------------------- 响应式设计 ------------------- */
@media (max-width: 992px) {
  .products-grid {
    grid-template-columns: repeat(1, 1fr);
  }
  
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .专题-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .products-container {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .banner {
    height: 400px;
  }
  
  .banner-title {
    font-size: 36px;
  }
  
  .banner-desc {
    font-size: 18px;
  }
  
  .section {
    padding: 40px 0;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .product-item .product-image {
    width: 120px;
    height: 80px;
  }
  
  .product-details {
    padding: 10px;
  }
  
  .product-name, .product-spec {
    font-size: 14px;
  }
}

@media (max-width: 576px) {
  .header-content {
    height: 60px;
  }
  
  .logo {
    font-size: 20px;
  }
  
  .nav-link {
    padding: 0 10px;
    font-size: 14px;
  }
  
  .function-item {
    width: 35px;
    height: 35px;
    margin-left: 10px;
  }
  
  .mobile-menu-button {
    display: block;
  }
  
  .desktop-nav {
    display: none;
  }
  
  .mobile-menu {
    display: block;
  }
  
  .banner {
    height: 300px;
  }
  
  .banner-title {
    font-size: 28px;
  }
  
  .banner-desc {
    font-size: 16px;
    margin-bottom: 20px;
  }
  
  .category-grid {
    grid-template-columns: repeat(1, 1fr);
  }
  
  .专题-grid {
    grid-template-columns: repeat(1, 1fr);
  }
  
  .advantages-grid {
    grid-template-columns: repeat(1, 1fr);
  }
  
  .footer-content {
    flex-direction: column;
    gap: 20px;
  }
  
  .footer-column {
    min-width: auto;
  }
}